Oxygen lance bonded slag removal furnace and online slag removal method

Abstract

The invention relates to an oxygen lance bonded slag removal furnace and an online slag removal method.The oxygen lance bonded slag removal furnace comprises a slag melting furnace body, a slag scraping part, a heating element and the like, the heating slag melting temperature is adjusted through the high-temperature heating element in the slag melting furnace body according to slag components, and the slag melting temperature is adjusted through the auxiliary oxidation effect of oxidizing gas; and the slag scraping part adopts multiple layers of scrapers for collaborative operation, so that a slag layer adhered to the oxygen lance is fully melted and drips, and the slag removal time is remarkably shortened. After the furnace for eliminating the bonded slag of the oxygen lance is used, the time for replacing the bonded slag of the oxygen lance on line is saved, and the hazard of lance sticking in single-lance smelting is reduced; cost is saved, and production efficiency is improved. The replacement and repair of the oxygen lance are reduced, the maintenance cost is reduced, and the production continuity is ensured; the labor intensity is reduced and the working environment is improved. According to the device, automatic cleaning can be achieved, manual operation is reduced, the labor intensity is reduced, pollutants such as dust and smoke generated during manual treatment are reduced, and the working environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter steelmaking in iron and steel metallurgy, and more specifically, to an oxygen lance slag adhesion elimination furnace and an on-line slag removal method. Background Art

[0002] During the converter steelmaking process, the oxygen lance, as the core equipment for supplying oxygen to the molten bath, has long faced serious slag adhesion problems. The slag adhesion is mainly caused by factors such as splashing generated by the interaction between the oxygen jet and the liquid metal, post-combustion of CO gas generated by the decarburization reaction, and changes in the physical properties of the slag. The adhered slag layer not only reduces the cooling effect of the oxygen lance, leading to damage to the nozzle or even an explosion accident of the lance, but also may cause the imbalance of the lance body and the disorder of the oxygen jet, directly affecting the control of molten steel composition and smelting efficiency.

[0003] Currently, the solutions for oxygen lance slag adhesion mainly include the following categories:

[0004] Optimization of slag composition: By adjusting the content of elements such as silicon and aluminum in the slag to reduce the viscosity, but the raw materials fluctuate greatly, the composition control is difficult, and the actual application is limited.

[0005] Improvement of oxygen lance structure: Optimize the nozzle design to reduce splashing, but due to the dynamic change of the converter furnace type, the oxygen lance needs to be adjusted frequently, resulting in a significant increase in cost.

[0006] Regulation of process operations: Precise control of oxygen blowing parameters and molten steel temperature, however, the production raw materials fluctuate frequently, and the stability is difficult to guarantee.

[0007] High-temperature anti-adhesion coating: Spraying a refractory coating to assist slag removal, but the coating cost is high, and there are safety risks in spraying in a high-temperature environment.

[0008] Furnace chamber waste heat baking: Utilize the idle time between furnace stops to bake the adhered slag, but it seriously interferes with the smelting rhythm and has low efficiency.

[0009] Mechanical slag scraping device: Rely on the pulling force during the lifting of the oxygen lance to scrape the slag layer, but the removal effect on the hardened slag layer is poor, and it is easy to damage the lance body.

[0010] The above methods generally have problems such as high cost, poor applicability, complex operation, or incomplete slag removal, and it is difficult to achieve efficient on-line treatment of oxygen lance slag adhesion. In addition, manual slag removal has a high labor intensity, a harsh environment, and frequent replacement of the oxygen lance leads to production interruption, further exacerbating the time and resource consumption.

[0011] Therefore, there is an urgent need for an automated, high-efficiency, and low-intervention oxygen lance slag adhesion elimination device and method to ensure the continuity, safety, and economy of converter steelmaking. Summary of the Invention

[0012] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent.

[0013] To this end, an object of the present invention is to provide an oxygen lance slag removal furnace to solve the shortcomings of the existing methods.

[0014] Another object of the present invention is to provide an online slag removal method for an oxygen lance slag removal furnace.

[0015] The technical solution of the present invention is an oxygen lance slag removal furnace, comprising:

[0016] The slag melting furnace body is arranged at the gun waiting platform, with an opening at the top for the oxygen supply gun to extend in or out, a furnace cavity is formed inside, and a slag storage tank is arranged at the bottom;

[0017] A slag scraping part, movably arranged in the furnace chamber and close to the opening of the slag-removing furnace body, for scraping off sticky slag;

[0018] A heating element is installed in the furnace cavity and located at the bottom of the slag scraping part, and can adjust the heating slag melting temperature according to the slag composition;

[0019] Wherein, the furnace cavity has an inlet for introducing oxidizing gas at a position opposite to the heating element.

[0020] According to the oxygen lance slag removal furnace of the present invention, the diameter of the furnace chamber is 2-3 times the diameter of the oxygen lance.

[0021] According to the oxygen lance slag elimination furnace of the present invention, the slag scraping part has more than two layers of scrapers, the first layer of scrapers is a circular ring-shaped structure with multiple petals that can be opened and closed, and the slag scraping state is driven by the first driving part, and the oxygen lance slag scraping can be clamped, and the second layer of scrapers is located below the first layer of scrapers, and the end thereof is a toothed structure.

[0022] According to the oxygen lance slag removal furnace of the present invention, the slag scraping part also includes a third layer of scrapers located below the second layer of scrapers, and the second layer of scrapers and the third layer of scrapers form a mutually staggered tooth structure, which is driven to rotate alternately by the second driving part.

[0023] According to the oxygen lance slag elimination furnace of the present invention, the first layer of scrapers has a downward slope of 5° to 15°, and the tooth structure spacing between the second layer of scrapers and the third layer of scrapers is 10 to 30 mm.

[0024] According to the oxygen lance slag removal furnace of the present invention, the heating element is a resistance heating element or an electromagnetic induction coil.

[0025] According to the oxygen lance slag elimination furnace of the present invention, a nozzle is provided at the inlet of the furnace chamber for introducing the oxidizing gas, the oxidizing gas is air or oxygen-enriched air, and the gas flow rate is adjusted by a flow valve in the range of 50 to 200 L / min.

[0026] According to the oxygen lance slag removal furnace of the present invention, the slag storage tank is raised and lowered by a lifting rod.

[0027] The online slag removal method of the oxygen lance slag removal furnace of the present invention comprises the following steps:

[0028] S1. Move the oxygen lance to be treated to the lance waiting platform, start the heating element in the slag melting furnace body, and heat the furnace to the preset slag melting temperature;

[0029] S2. Introduce oxidizing gas into the furnace, and the gas flow rate is adjusted according to the furnace size and slag composition;

[0030] S3, scraping slag in the scraping part;

[0031] S4. Maintain the furnace temperature and monitor the slag dripping state in the slag storage tank; lift the oxygen lance and scrape off the residue on the surface of the oxygen lance through the slag scraping part; if the lifting of the oxygen lance is blocked, further scrape the slag until no slag continues to fall and slagging is completed.

[0032] According to the online slag removal method of the present invention, the preset slag removal temperature of the heating element in S1 is adjusted according to the thickness of the sticky slag;

[0033] In S3, the scraper is used on the first layer to control the opening and closing of the petals to scrape away the sticky residue;

[0034] If the oxygen lance is obstructed in S4, the second and third scrapers are used to rotate alternately to break the stuck slag layer;

[0035] The slag drop state is monitored by real-time monitoring with a camera, or by using a weight sensor to detect the weight change of the slag in the slag storage tank;

[0036] After the slag falls into the slag storage tank, the height of the lifting rod is adjusted to adapt to the position of the oxygen gun to complete the online slag removal. It can be seen from the above technical solution that compared with the prior art, the present invention has the following technical effects:

[0037] 1. The present invention can realize the integration of efficient slag and scraping slag. The high-temperature heating element in the slag melting furnace body is quickly heated to 1300-1800°C, and the auxiliary oxidation effect of the oxidizing gas (air / oxygen-enriched air) is combined to make the slag layer adhered to the oxygen lance fully melted and dripped, which significantly shortens the slag removal time. After using the oxygen lance slag elimination furnace of the present invention, the time for online replacement of the oxygen lance due to slag sticking to the oxygen lance is saved, and the harm of sticking to the oxygen lance during single-gun smelting is reduced; cost is saved and production efficiency is improved. The replacement and repair of the oxygen lance are reduced, the maintenance cost is reduced, and the continuity of production is ensured; the labor intensity is reduced and the working environment is improved. The device can realize automatic cleaning, reduce manual operation, reduce labor intensity, reduce pollutants such as dust and smoke generated during manual processing, and improve the working environment. The service life of the oxygen lance is increased. The number of repairs of the oxygen lance sticking and the hazards such as cracking and internal leakage of the weld after repair are reduced, and the service life of the equipment is extended.

[0038] 2. The slag scraping part adopts multi-layer scrapers to work together: the first-layer scraper clamps the oxygen lance (1) through split closing to scrape the loose slag layer on the surface; the toothed structures of the second-layer scraper and the third-layer scraper rotate alternately (with a spacing of 10-30 mm), which can break the hardened slag layer and avoid the risk of lance jamming.

[0039] 3. The height of the slag storage tank is adjustable: the position of the slag storage tank can be adjusted through an electric lifting rod to adapt to the insertion depth of oxygen lances of different lengths, improving the versatility of the equipment.

[0040] 4. The state of slag droplets is monitored in real time through a camera or a weight sensor, and the end point of slag melting is automatically judged to reduce manual intervention.

[0041] 5. The flow rate of the oxidizing gas is controllable (50-200 L / min) to avoid furnace temperature fluctuations or energy waste caused by excessive gas.

[0042] 6. The operation process of the present invention is simple and practical, which solves the problem of oxygen lance slag sticking, avoids physical damage to the surface of the oxygen lance caused by traditional mechanical slag scraping, scrapes the residual slag more thoroughly after slag melting, and reduces the repair frequency of the oxygen lance. It can effectively improve the service life of the oxygen lance, the production efficiency and safety of converter steelmaking, while reducing the maintenance cost and extending the service life of the equipment. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0044] Figure 1 It is a schematic structural diagram of an oxygen lance slag removal furnace provided by the present invention;

[0045] Figure 2 It schematically shows the positions of the first-layer scraper, the second-layer scraper and the third-layer scraper in the furnace;

[0046] Figure 3 It schematically shows the slag scraping state of the second-layer scraper and the third-layer scraper;

[0047] Figure 4 It schematically shows the schematic diagram before the oxygen lance is slag scraped;

[0048] Figure 5 It schematically shows the schematic diagram after the oxygen lance is slag scraped;

[0049] Figure 6 It is a schematic diagram of the steps of the on-line slag removal method provided by the present invention. Detailed implementation manners

[0050] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0052] Since the existing solutions for slag adhesion on the oxygen lance generally have problems such as high cost, poor applicability, complex operation, or incomplete slag cleaning, it is difficult to achieve efficient on-line treatment of slag adhesion on the oxygen lance. In addition, manual slag cleaning has a high labor intensity, a harsh environment, and frequent replacement of the oxygen lance leads to production interruption, further exacerbating the time and resource consumption.

[0053] In view of this, the technical solution provided by the present invention is an oxygen lance slag removal furnace, see the attached Figure 1 , including: a slag melting furnace body 3, a slag scraping part 2 and a heating element 4;

[0054] The slag melting furnace body 3 is arranged at the lance platform 6, which does not affect the smelting rhythm of the converter. The top has an opening for the oxygen lance 1 to extend in or out. Its interior forms a furnace cavity, and the diameter of the furnace cavity is 2-3 times the diameter of the oxygen lance 1. A slag storage tank 7 is arranged at the bottom of the slag melting furnace body 3;

[0055] The slag scraping part 2 is movably arranged in the furnace cavity and near the opening of the slag melting furnace body 3 for scraping the adhered slag 11;

[0056] The heating element 4 is installed in the furnace cavity and below the slag scraping part 2, and can adjust the heating and slag melting temperature according to the slag composition, and can quickly heat up and keep warm; it is set according to the converter slag composition and is adjustable in the range of 1300-1800 °C:

[0057] Among them, an inlet for introducing an oxidizing gas is provided at the position of the furnace cavity relative to the heating element 4.

[0058] The slag storage tank 7 is an uncovered cuboid. The slag storage tank 7 can store molten slag. It is located below the lance platform. The lance platform is hollow. The slag storage tank can be adjusted up and down electrically through the lifting rods 5 at the four corners of the tank.

[0059] In the embodiments of the present invention, see the attached Figure 2 and 3 The scraping part 2 has more than two layers of scrapers. The first layer of scrapers 8 is a circular ring structure with multiple petals (2-6 petals) that can be opened and closed, with an oxygen gun insertion hole reserved in the middle. The scraping state is driven by the first driving part and can clamp the oxygen gun 1 to scrape the slag. The second layer of scrapers 9 is located at the lower part of the first layer of scrapers 8, and its end is a toothed structure.

[0060] Advantageously, the scraper section 2 further comprises a third layer of scrapers 10 located below the second layer of scrapers 9 , and the second layer of scrapers 9 and the third layer of scrapers 10 form a mutually staggered tooth structure, which are driven to rotate alternately by a second driving section.

[0061] More advantageously, the first scraper layer 8 has a downward slope of 5° to 15°, and the tooth structure spacing between the second scraper layer 9 and the third scraper layer 10 is 10 to 30 mm.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] Wherein, the heating element 4 is a resistance heating element or an electromagnetic induction coil.

[0064] In an embodiment of the present invention, a nozzle 12 is provided at the inlet of the furnace chamber for introducing the oxidizing gas, the oxidizing gas is air or oxygen-enriched air, the gas flow rate can be changed according to the size of the furnace and the slag composition, and the gas flow rate is adjusted by a flow valve in the range of 50-200L / min.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] The present invention also provides an online slag removal method for the oxygen lance slag removal furnace based on the above embodiment, see the attached Figure 6 , including the following steps:

[0067] S1. Move the oxygen lance to be treated to the lance waiting platform, start the heating element in the slag melting furnace body, and heat the furnace to the preset slag melting temperature;

[0068] S2. Introduce oxidizing gas into the furnace, and the gas flow rate is adjusted according to the furnace size and slag composition;

[0069] S3, scraping slag in the scraping part;

[0070] S4. Maintain the furnace temperature and monitor the slag dripping state in the slag storage tank; lift the oxygen lance and scrape off the residue on the surface of the oxygen lance through the slag scraping part; if the lifting of the oxygen lance is blocked, further scrape the slag until no slag continues to fall and slagging is completed.

[0071] Advantageously, the preset slag-melting temperature of the heating element in S1 is adjusted according to the thickness of the sticky slag;

[0072] In S3, the first layer of scrapers is used to scrape the slag, and the petals are opened and closed to scrape off the sticky slag; the first layer of scrapers is close to the sticky slag layer of the oxygen lance, and when the oxygen lance is lifted, the residue of the oxygen lance is scraped off;

[0073] S4 If the first layer of scraper is stuck with slag and cannot lift the oxygen lance, that is, the lifting of the oxygen lance is blocked, the second layer of scraper and the third layer of scraper are used to rotate alternately to break the stuck slag layer;

[0074] The slag drop state is monitored by real-time monitoring with a camera, or by using a weight sensor to detect the weight change of the slag in the slag storage tank; it is determined according to the slag droplets dripping into the slag storage tank. For example, a camera is used to observe the melting of the slag stuck to the oxygen lance. When it is observed that there are very few slag drops, the insulation time is up, and the slag is melted and the heating is stopped; if a weight sensor is used, it is necessary to obtain the weight of the slag in the slag storage tank.

[0075] After the slag falls into the slag storage tank, adjust the height of the lifting rod to adapt to the position of the oxygen gun to complete the online slag removal.

[0076] In a specific embodiment, an oxygen lance slag removal furnace is first prepared, and the hollow furnace diameter of the slag removal furnace body is 2.5 times the diameter of the oxygen lance. An electromagnetic induction coil (heating element 4) is arranged on the inner wall of the furnace. The slag scraping part 2, the first layer of scrapers is a 4-petal structure with a slope of 10°; the second layer of scrapers and the third layer of scrapers have a tooth spacing of 20mm, and they rotate alternately through electric drive. The slag storage tank is adjusted in height by a hydraulic lifting rod, and the lifting range is 300mm.

[0077] Slag removal process:

[0078] The temperature is raised and the gas is introduced, the oxygen gun 1 is moved to the gun waiting platform 6, and the electromagnetic induction coil is started to heat to 1580° C. Air is introduced from the bottom nozzle, and the flow rate is set to 100 L / min.

[0079] Oxygen lance insertion and slag scraping. Open the 4 split parts of the slag scraping section, insert the slag-sticking section of the oxygen lance into the furnace cavity, and close the split parts to clamp the oxygen lance. Keep warm for 20 minutes, and the camera monitors the slag droplet frequency in the slag storage tank. When the interval between slag droplets > 2 minutes, it is determined that the slag melting is completed.

[0080] Residue removal and lifting. Lift the oxygen lance, and the first-layer scraper scrapes the surface residue;

[0081] When encountering the resistance of stuck slag, start the second-layer scraper and the third-layer scraper to rotate in the reverse direction (10 rpm) to break the slag layer.

[0082] Adjust the slag storage tank 7 to descend 150 mm to collect the molten slag.

[0083] The effect of this embodiment: The oxygen lance after slag removal is as Figure 5 shown, and before slag removal is as Figure 4 . The slag-sticking removal rate of the oxygen lance > 95%, the single treatment time is shortened by 60% compared with the traditional baking method, and there are no scratches on the surface of the oxygen lance.

[0084] In another specific embodiment, the slag melting furnace body 3 has a furnace cavity diameter 3 times that of the oxygen lance diameter and uses an electromagnetic induction coil (heating element 4). The slag scraping section, the first-layer scraper is a 6-split structure with a slope of 15°; the tooth pitch between the second-layer scraper and the third-layer scraper is 30 mm, and they rotate in the same direction through hydraulic drive.

[0085] Slag removal process: Heat the slag melting temperature to 1680 °C; introduce oxygen-enriched air (oxygen concentration 30%) with a flow rate of 150 L / min.

[0086] The slag scraping and monitoring are linked. The weight sensor monitors the weight change of the slag storage tank in real time. When the weight growth rate < 0.1 kg / min, it is determined that the slag melting is completed.

[0087] The second-layer scraper and the third-layer scraper rotate in the same direction at 15 rpm to break the high-hardness slag layer.

[0088] Effect: It is applicable to the sticky slag 11 with poor fluidity, the incidence of stuck slag can be reduced by 80%, and the service life of the oxygen lance is extended by 3 times.

[0089] It should be noted that the scraper drive method in the above embodiments of the present invention can be realized by the prior art. For scraping off the melted sticky slag, the scraper can be arranged in the furnace chamber, or can be closed or rotated by electric or pneumatic means.

[0090] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0091] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An oxygen lance slag removal furnace, characterized in that: include: The slag melting furnace body (3) is arranged at the gun waiting platform (6), has an opening at the top for the oxygen supply gun (1) to extend into or out of, forms a furnace cavity inside, and has a slag storage tank (7) arranged at the bottom; A slag scraping part (2) is movably arranged in the furnace chamber and close to the opening of the slag-removing furnace body (3) and is used for scraping off sticky slag; A heating element (4) is installed in the furnace cavity and located at the lower part of the slag scraping part (2), and can adjust the heating slag melting temperature according to the slag composition; The furnace cavity has an inlet for introducing oxidizing gas at a position opposite to the heating element (4).

2. The oxygen lance slag removal furnace according to claim 1, characterized in that: The diameter of the furnace chamber is 2-3 times the diameter of the oxygen lance (1).

3. The oxygen lance slag removal furnace according to claim 1, characterized in that: The scraping section (2) has more than two layers of scrapers. The first layer of scrapers (8) is a circular ring-shaped structure with multiple petals that can be opened and closed. The scraping section (2) is driven by a first driving section to scrape the sticky residue and can clamp the oxygen gun (1) to scrape the residue. The second layer of scrapers (9) is located below the first layer of scrapers (8) and has a toothed structure at its end.

4. The oxygen lance slag removal furnace according to claim 3, characterized in that: The scraping section (2) further comprises a third layer of scrapers (10) located below the second layer of scrapers (9); the second layer of scrapers (9) and the third layer of scrapers (10) form a mutually staggered tooth structure and are driven to rotate in a staggered manner by a second driving section.

5. The oxygen lance slag removal furnace according to claim 4, characterized in that: The first layer of scrapers (8) has a downward slope of 5° to 15°, and the spacing between the tooth structures of the second layer of scrapers (9) and the third layer of scrapers (10) is 10 to 30 mm.

6. The oxygen lance slag removal furnace according to any one of claims 1 to 5, characterized in that: The heating element (4) is a resistance heating element or an electromagnetic induction coil.

7. An oxygen lance slag removal furnace according to any one of claims 1 to 5, characterized in that: A nozzle (12) is arranged at the inlet of the furnace chamber for introducing the oxidizing gas. The oxidizing gas is air or oxygen-enriched air. The gas flow rate is adjusted by a flow valve within a range of 50 to 200 L / min.

8. The oxygen lance slag removal furnace according to any one of claims 1 to 5, characterized in that: The slag storage tank (7) is raised and lowered by a lifting rod (5).

9. An online slag removal method for an oxygen lance slag removal furnace according to any one of claims 4 to 8, characterized in that: The following steps are involved: S1. Move the oxygen lance to be treated to the lance waiting platform, start the heating element in the slag melting furnace body, and heat the furnace to the preset slag melting temperature; S2. Introduce oxidizing gas into the furnace, and the gas flow rate is adjusted according to the furnace size and slag composition; S3, scraping slag in the scraping part; S4. Maintain the furnace temperature and monitor the slag dripping state in the slag storage tank; lift the oxygen lance and scrape off the residue on the surface of the oxygen lance through the slag scraping part; if the lifting of the oxygen lance is blocked, further scrape the slag until no slag continues to fall and slagging is completed.

10. The online slag removal method according to claim 9, characterized in that: The preset slag melting temperature of the heating element in S1 is adjusted according to the thickness of the sticky slag; In S3, the scraper is used on the first layer to control the opening and closing of the petals to scrape away the sticky residue; If the oxygen lance is blocked in S4, the second and third scrapers are rotated alternately to break the stuck slag layer; The slag drop state is monitored by real-time monitoring with a camera, or by using a weight sensor to detect the weight change of the slag in the slag storage tank; After the slag falls into the slag storage tank, adjust the height of the lifting rod to adapt to the position of the oxygen gun to complete the online slag removal.

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